High-pressure water-tube boiler with divided header



Aug. 5, 1930.v

DOEBLER 1,772,307

HIGHPRESS'URE WA TER TUBE BOILER WITH DIVIDED HEADER Fired Sept. 3, 1926 2 Shoots-Shoot 1 Aug. 5, 1930. A. DO EB LER 1,772,307 HIGH PRESSURE WATER TUBE BOILER WITH DIVIDED HEADER Filed Sept. 5, 1926 2 Shuts-Shoot 2 Muemfar:

.2 the boiler drum and the steam can separate header," accordingitotheinvention, the front; 70

- mixture and impedes more or less the cirtojoeyond the waterlevel so that asteam space 75 Patented Aug. 5, 1930 g l I 1372307.v

.Intermitte twimm msome15mm) iinnnnn i i t Apnlicat ion fi led satellites 3,; 126,]saa1.m. 1 414;1insea settem rv,15251. l

, Inboilerswith *dividedheader of known; chambers areidentical as regards shapeand type the front andirear header divisionsare size. The special shape of the header di-I diiierent and, 'owingto' this difference the visions makes" it .possible' to arrange, at the circulating tubes which connect the'header front andatthe rear any number ofcircu' 5 divisions withitheboilef drumare dilierent latio'nl tubes 3. andf i. The circulation tubes 55,

at the .frontendand atthere'ar end. 'Insome are not soldered atany point to the header boilertypes more than one ciroulatingtube divisions but welded'in' as into the boile has beenarranged"inoneheader'division. drumflrThe number of; circulation tubesiis Between t he rear headerdivisionsiand the selected "so that the "free cross section of'the 1'0 boiler drum Onlyone circulating tube could front circulation tubes andof the rear cir- 66 be arranged in one header" division ,the'free culation tubes is equal to .or greaterf than cross sectionifoi fthesej circulating tubes was the cross section of the header divisions consequently smaller than the free cross secwherebyltheWatercirculationisacceleratedj tion of the chamber whereby the return flow All circulation tubes are quite as easily ac-i 1 w of the water to the header divisions was cessibleas the 'wate'r'tubesandjit is easyte rendered more difficult. The mixture asclean thesamefl'lfhefrontjcirculation tubes cending in the front header chambers is are'identical to the rear circulationtubes'gas further conducted through the front circuregards number, size and length.

lation tubes in. a direction of flow towards f In the water-t be boiler with divided only in the boiler drum. As the specific gravcirculation tubes,as shown in Fig. 1, are atity of the mixture is lower than that of the ranged so that they are all situatednnder Q water in the boiler drum the water from the neath: the water? level. The upperends of boiler drum presses against the infiowing the front header divisions re. all extended culation. All these inconveniences are obis produced in each header division. In viated, according to the invention, by a spethese upper ends of the header" divisions the cial construction of the header-chambers and steam separates from the ascending mix by a special arrangement of the circulation ture. The jheaderdivisions are then 'conm at tubes. Iieeted'at the top "ends with theboiler drum Several embodiments of the invention are by tubes 5 through which the separated shown, by way of example, on the accomsteam flows into the boiler drum. From this panyingdrawings, in which t it, results thatfthewhole cross section ofthe Fig. 1 is a sideelevation, partly in section, circulation tubes canbe utilized forthe water 0f the preferred form of construction ofa circulation; I '85 high pressure water-tube boiler -with di- Eachifront header divis ion' canibe convided header, according to the invention. nected simply to the boiler drum The steam Fig. 2 shows in side elevation a modified might however first be conducted,' as shown W form of construction of the top end of a front in Fig. ,2, into a steam-collector chamber fi, header division. v whichisarranged;transversely to the header Fig. 8 is a view similar to Fig. 2 showing division, and from this collector chamber the front water-tubes arranged at an angle by'one or moretubes7 to the boiler drum. of 45. The water tubesjmaybearranged at any Fig. 4 is a front elevation of Fig. 2. angle... Fig. 1 shows that theyare arranged In the water-tube boiler with divided atl'an angle of'30. The boiler is low in pro header, according to the invention, the exportion to its length; this boiler constructensions of the header divisions 2, connected tion is consequently well adapted for low. to the front and rear ends of the water tubes boilerhousesk If- "the water-tubes are ar- 1, are bent at the top end at an equal angle rangedyas shown in Fig-. 3,'at an angle of j 50 in outward direction and the frontand rear 45 the rear circulation tubes stand-vertical. 0" t the same free cross section as the header divisions, the return flow of the water is carried throughwith'certainty down to the low est water tube. When the boiler is forced,

thejlower tubes will not become empty, and

burningthrough of the lower water tubesois avoided. As all the circulationtubesand, also all the water tubes are easily accessible fioml theouter side the examination is extremely simple. The boiler does not contain anyf sensitive pointspit is adapted for the highest pressuresandthe maximumsecurity a v p f perfendicularthrou'gh the center of the bo1l c er s of service is ensured,

I]o1a1m a g a a 1. A17 high-pressure compartment, watert'ube boiler, comprising in combination a,

transverse'boiler drum, front header divi sions, an upper extension ofeach front'head er division bent upward and extending be yond the water level so that a steam space.

is'formed in theupper end of-each extension,

a transversefsteam collecting element ar rangedon the upper ends, of and connected to said extensions of said front header diVi':

sionsfupper steam overflow pipes connect ing said steam collecting space with the steam space of the boiler drum, andfa group of connecting pipes between each front header division and the boiler drum situated underneath the water level of said boiler drum so that;

said upper steam over-flow pipes serve mere:

ly for the circulation of steam, the lower group of connecting. pipesserving for the, circulation of Water. i

2. A high pressure compartmennwater. tube" boiler comprising in combination with: a transverse boilerdrum, front header divi sions and rear header divisions, upwardly di-s rected and outwardly bentextensions one on each header division, a group of water circus lation tubes connecting said extensions of,

said front. header divisions with the water space. of said boiler drum and being of at least the same free cross section as'the adja-W 7 cent header extensions and correspondingas regards number, size and shape accuratelywith said water circulation tubes of said header divisions.

3. A high pressure compartment water tube boiler, comprising in combination with a transverse boiler drum, front header divisions, rear header divisions and boiler tubes connectedbetween said front and rear header division, upwardly directed and outwardly bent extensions oneon each header division, a group of'water circulation tubes connecting said extensions of said front header divisions with the water space of said boiler drum,,and;a1 group ,eofiwater circulation tubes connecting said extensions of said rear headerdivisions with "the water 5 space of said boiler drum, and being of at le astuthe same free cross sectionas the adjacent header extensionsand corresponding as. regards number, size and shape accurately'with said water mm on the, boiler tubes.. In testimony whereof I afiix my signature. a DOEBLER;

space ofsaid drum, anda group of water circulat on tubes connectingv said extensions. of said rearheader d visions with the water: 

